[ i» ] 
G. 
Account of fome, which cooled in bafaltic forms, p. 375* 
Gold Shells , fo called, fuppofed not to be fhells, but a fpecies of the Cochineal in its 
pupa ftate, p. 168. 
Goodrich , John, A Series of Obfervations on, and a Difcovery of the Period of, the 
Variations of Light of the Star marked ^ by Bayer, near the Head of Cepheus, p. 48. 
the lofs which aftronomy will receive from his death, p. 424. 
Graduations , improvements in, by Mr. Ramfden, p. 17. Further improvements by 
Henry Bindley, p. 19. Propofed improvements by Mr. Smeaton, p, 31. 
Graham , Mr. improvements in the mural quadrant made by him, p. 10. Completes a 
zenith fedor, 1727, p. 
H. 
Hamilton , Sir William , Particulars of the prefent State of Mount Vefuvius, . with a 
Journey into the Province of Abruzzo, and a Voyage to the Ifland (>'. Ponza, 
p. 363. With the affiflance of Father Piaggi kept a journal of the operations of 
Vefuvius from Augufl 1779 to the prefent time, - p. 366. 
Harrogate , Obfervation on the fulphur wells there, p. 171. Only three wells, in 
1733; the fourth made about forty years ago, p. ibid. Several other iolpnureous 
fprings there, p. 172. Salt recommended to be added to the water for hat hi; <w, p. 
175. Temperature of the fprings, ibid. All the fprings impregnated with common 
fait, p. 177. Medium quantity of fait about two ounces to the jjallo , p, ’78,. 
Obfervations and experiments on the fulphureous impregnation of thefe water , p. 
179. The water fprings out of Shale, p. 187. 
Heat, new experiments upon, p. 2 73. Conducted in the fame manner as the eledric 
fluid, p. 274. Atmofpheric air a better condudor of heat than the Torricellian 
vacuum, p. 286. Description of the inftruments made ufe of, p. 274. 278. 287. 
Experiments on the conducting power of mold air, p. 294. Experiments with air 
of different denfities, p. 298. Experiments on the conducting powers of water -and 
of mercury, p. 301. Table of the- conducting powers of the various experiments, 
p. 303. Additional obfervations on making a thermometer for meafuring the higher 
degrees of, p. 390. 
Helix, Defcription of a new-difeovered Britifh fheil, called the Fountain Helix, p. 
165. The tender prickly Helix, p. 166. 
Hepatic Air, experiments on, p. 1 18. What are its properties, ibid. General characters 
of, p. 127. The adion of hepatic and other aerial fluids on each other, p. 30. 
The adion of hepatic air, and acid, alkaline and inflammable liquid, on each other, 
p. 137. The properties of water faturated with it, p. 141,, The properties of alka- 
line 
